A method and apparatus for tuning the torsional natural frequency of a rotor is disclosed. To remove rejects or proof sheets as required, the delivery transports the materials along a transport path over a stack that is otherwise built up and transfers the sheets to the support surface. The resin mold has no connection portion of a casing so that the transceiver has high water resistance and high impact resistance. The computing device then may determine to route the telephone call to a certain endpoint based on the voice biometric confidence score.